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What is meant by saying at what current is transistor biased?
The saying "at what current is transistor biased" means to ask the current through the transistor when there is no signal present. Typically, a transistor is biased at the center of its linear region, so as to minimize distortion. This, of course, depends on whether or not the transistor is AC or DC coupled, and where the clipping points might be.
How do clamping and clipping circuit works?
A Limiter , by the action of a diode and its biasing will pass signals to its out put. A positive limiter will completely limit the positive portion of an AC waveform. A Negative Limter will limit the negative portion of a wave form. To truelly understand this concept, you must fully understand diodes and how they are Forward Biased and Reversed Biased. When A diode is Forward Biased, meaning that the Anode is more positive than the Cathode, the diode acts as a short and when a diode is reversed biased, it will act as an open, no current flow. A juntion diode by design will only allow current to flow from cathode to anode. A Clamper circuit uses a capacitor, resistor and a diode to fix an ac waveform to a DC level. This is accomplished by the quick charging of a Capacitor through a diode but the discharge path is through a large resistor. Due to RC time contants, the capictor is not geven enough time to discharge befor the next charge arrives thus acting as a voltage doubler. TC= Time Contant = Resistance in Ohms times the Capacitance in Farrads that is measured in seconds. It takes 5 TC's to fully charge. By adding a DC Bias, we are now able to set a newclamping point other that the 0 Volt reference.
Why the n-jfet is operated with the negative voltage not the positive voltage?
In a JFET the only insulation between the gate and the channel is a reverse biased diode junction, if this junction becomes forward biased then the gate and channel are effectively shorted and the device no longer acts as a transistor (it will act as a forward biased diode instead). In the n-channel JFET, the gate is the P-side of this diode and the channel is the N-side of this diode. To keep this diode reverse biased (and the device operating as a transistor) therefor the gate MUST always be maintained at a voltage more negative than the most negative section of the channel.
What does you are bias mean?
It is a sarcastic meme directed at internet comments that love to label anything that they don't agree with as proof of reporter being biased. The incorrect grammar ("bias" instead of the correct "biased") is intentional. It may just be representing the existence of so many grammar mistakes in comments in general or may be hinting towards the low intellect of the posters of such comments.
What is the function of diodes?
The Basic Function of Diode is to act as a switch. when it is ON(forward biased)it will allow the current to flow through itself by offering a low impedance in the circuit. When it is OFF ( Reverse Biased)it will not allow the current to pass through itsel by putting a high impedance in the circuit. A diode can also be used as a clamp, and as a detector (mixer) in an a.m. receiver.
How stability is achived in voltage divider biasing?
A: A transistor needs to be biased at a point whereby it is in a linear point with respect to the load otherwise it can give an output that is non linear or clipping. so with the proper bias the circuit is stable or useful.
What is best describes how a varactor diode modulator creates FM?
Resonant frequency of a circuit is proportional to sq rt (L x C). A varactor diode, when suitably voltage biased, looks like a capacitor (C). Varying the bias varies the capacitor and thus the resonant frequency .
What will happen if a diode is connected to capacitor?
the diode when forward biased will conduct and during reverse biased condition(generally doring reverse biased condition ckt is open mens no current flows;when register is connected)current flows but during reverse biased condition 1--for sometimes initially current flows due to discharging of capacitor. 2--then ckt will be having no current
What does LED do in a circuit?
light up when forward biased
What is the function of capacitor in full wave rectifier with smoothing capacitor circuit?
is a device that smoothen your half-wave rectification into a full-wave rectification after using a 4 diode and 1 resistor , after adding a capacitor , there will be a almost steady output , it charges the capacitor when is forward biased which is the first half wave , and discharge when is reverse biased to stablelize the wave into a almost same potential difference compare to a.c
What is the function of capacitor in rectifier?
is a device that smoothen your half-wave rectification into a full-wave rectification after using a 4 diode and 1 resistor , after adding a capacitor , there will be a almost steady output , it charges the capacitor when is forward biased which is the first half wave , and discharge when is reverse biased to stablelize the wave into a almost same potential difference compare to a.c
What is junction capacitor in integrated capacitors?
reverse biased PN junction MOS capacitors are more common
What happen to the voltage when the collector current increases in a biased circuit?
it dies
What is the difference between constant current bias and current mirror circuit?
current mirror circuit produce more stability as compared to biased circuit.
What is meant by saying at what current is transistor biased?
The saying "at what current is transistor biased" means to ask the current through the transistor when there is no signal present. Typically, a transistor is biased at the center of its linear region, so as to minimize distortion. This, of course, depends on whether or not the transistor is AC or DC coupled, and where the clipping points might be.
How does the positive clamper works in electronic circuits?
A negative clamper circuit is considered. It shifts original input signal in a downward direction.While positive input is applied, diode is forward biased. The output voltage is Vo which is equal barrier potential of the diode. The capacitor is charged to V-Vo.When negative input cycle, diode does not conduct because it is reverse biased and the capacitor can not discharge very much because time constant (RC) choosen is high. Now output is sum of input voltage and capacitor voltage and it is equal to -(2V - Vo). Now peak to peak output voltage is difference of output voltages when positive and negative half cycles and it is equal to V-(-(2V - Vo)) or 2V.In negative clamper, input signal is pushed downward and positive peak of the output signal coincides with zero level.In positive clamper circuit, unlike in negative clamper circuit, diode is connected reversely.There is no change in connection of capacitor. But resistor is connected after diode. Positive clamping circuit shifts a input signal in upward direction. The output of this circuit shows that negative peak of signal coincides with zero level.
How do clamping and clipping circuit works?
A Limiter , by the action of a diode and its biasing will pass signals to its out put. A positive limiter will completely limit the positive portion of an AC waveform. A Negative Limter will limit the negative portion of a wave form. To truelly understand this concept, you must fully understand diodes and how they are Forward Biased and Reversed Biased. When A diode is Forward Biased, meaning that the Anode is more positive than the Cathode, the diode acts as a short and when a diode is reversed biased, it will act as an open, no current flow. A juntion diode by design will only allow current to flow from cathode to anode. A Clamper circuit uses a capacitor, resistor and a diode to fix an ac waveform to a DC level. This is accomplished by the quick charging of a Capacitor through a diode but the discharge path is through a large resistor. Due to RC time contants, the capictor is not geven enough time to discharge befor the next charge arrives thus acting as a voltage doubler. TC= Time Contant = Resistance in Ohms times the Capacitance in Farrads that is measured in seconds. It takes 5 TC's to fully charge. By adding a DC Bias, we are now able to set a newclamping point other that the 0 Volt reference.
